Kansan
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The frequency of the key fob is printed on the circuit board inside the fob, under the battery. My 24 Flash shows 434 MHz and my 23 Lariat 5.0 shows 902 MHz.
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Issue programming a new key
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EVpower
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I was 0 for 20 tries programming a new key fob until I followed the instructions on fob placement in the back up slot.
Steve
Steve
CptnWookenstein
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Can you show exactly how you determine that?
So I have a 24' flash and I heard that same thing in another thread, recently I picked up a second backup fob in the 433mhz range and now this time I'm have zero success and getting the "failed programming" notification where the original 315 says successful but then doesn't do anything.
I feel like I'm missing something and or taking crazy pills
EVpower
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The FCC ID numbers on the working fob and the fob to be programmed should be the same for the fobs to be on the same frequency band.
The ID is printed underneath the key.
Steve
The ID is printed underneath the key.
Steve
bmwhitetx
Well-known member
Like @EVpower said, you need to check the FCC ID. See this post for a pic
https://www.f150lightningforum.com/forum/threads/issue-programming-a-new-key.18193/post-471106
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CptnWookenstein
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This is what I was looking for thank you, I was aware of the ID info just not how to decipher it.
Kansan
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This is from my 23 5.0. There is a 902 printed on the board. I don’t have a picture of my 24 Flash circuit board.
This is the sticker that was on my 24 Flash Key Fob. It says 434 MHz
ER
EVpower
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Attached is a photo of the top of a fob with the key removed. If you zoom the image out the part number and the FCC ID number are readable.
On one of my fobs the some of the numbers were obscured. I hope you do not have the same problem.
Steve
On one of my fobs the some of the numbers were obscured. I hope you do not have the same problem.
Steve
Kansan
Well-known member
I picked key #5 from the Aliexpress link, which also let me select 434.26 MHz for my 24 Flash. I was able to program it tonight and it does in fact remote start the truck just like my ICE F150. So far it seems to function well - it allows me to unlock the truck by grabbing the door handle, the truck starts and runs, and I can open and close the power liftgate with the key fob. But, I am getting a DTC code B1218-00 Transmitter Identification Code. The code doesn't seem to be causing any issues.
I see that choice #8 allows selecting either 433.92 MHz or 434.26 MHz. I'm left wondering if the code B1218 is occurring because of the frequency - any idea of whether I should have selected 433.92 MHz instead of 434.26 MHz?
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TechnoSwiss
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Pretty sure 434 was the correct one, but the easiest way to know for sure, what's the FCC ID on your factory fob?
Kansan
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Thank you for the suggestion. I just checked the FCC ID shown on the factory FOB and it shows a frequency range of 433.589-434.251 MHz, just immediately below the frequency of the aftermarket FOB I paired to my truck, which claims a frequency of 434.26 MHz.
The aftermarket 434.26 MHz FOB is apparently close enough that it actuates all of the truck functions, but (I'm guessing) out of range enough that I'm getting the DTC. I wonder if there is any harm in using the 434.26 MHz FOB. Could the DTC cause other issues, such as preventing the truck to do an OTA update?
It took a dozen or so tries to get the FOB to pair to the truck. Don't know if it was a coincidence, but on the last try I buckled my seatbelt.
Kansan
Well-known member
I rebooted the body control module and was able to clear the DTC. It hasn’t returned. Maybe the DTC was due to programming with the frequency slightly off. Maybe that’s why it took a dozen tries to program the fob. It’s working perfectly now.
Kansan
Well-known member
I programmed another aftermarket key fob to my truck. It's a remote start F250 key fob with exactly matching FCC ID information. Worked perfectly. I learned two things:
- I received another DTC with this aftermarket key fob. I was able to clear it only after rebooting the body control module. I think that it's the programming of the aftermarket key fob that triggered a DTC - neither key fob triggers DTCs when I use it.
- The key to success in programming the additional key is to press and hold (not press and release) the start button on the last step - when the unprogrammed key is in the backup slot.
TechnoSwiss
Member
Huh, never had to press and hold the start button on the last set. What has worked for me, I found somebody mention instead of counting the time between turn on and turn off, you just listen to the dings, when the dings stop you turn it off, then move on to the next step. Once I did that it's worked first time each time.
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